package util;


import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
/**
 *
 *
  获取spring容器，以访问容器中定义的其他bean
 */
@Component
public class SpringContextUtil {

	private static ApplicationContext applicationContext;

	public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		SpringContextUtil.applicationContext = applicationContext;
	}

	public static ApplicationContext getApplicationContext() {
		assertApplicationContext();
		return applicationContext;
	}

	@SuppressWarnings("unchecked")
	public static <T> T getBean(String beanName) {
		assertApplicationContext();
		return (T) applicationContext.getBean(beanName);
	}

	public static <T> T getBean(Class<T> requiredType) {
		assertApplicationContext();
		return applicationContext.getBean(requiredType);
	}

	private static void assertApplicationContext() {
		if (SpringContextUtil.applicationContext == null) {
			throw new RuntimeException("applicaitonContext属性为null,请检查是否注入了SpringContextHolder!");
		}
	}
}

